A moodle using an stmp server usually requires turning on debugging to
see what (if any is discovered) attemtping to use an SMTP server as a
relay.
Run Linux? Having SMTP server troubles? Have command line access via ssh
and can install software? Well then ...
Found a CLI tool ... a perl script that can to as well. Requires
Perl. Can be installed an run in user space (ie, doesn't require
root).
SWAKS - Swiss Army Knife for SMTP
http://www.jetmore.org/john/code/swaks/
Ref docs:
http://www.jetmore.org/john/code/swaks/latest/doc/ref.txt
Questions:
http://www.jetmore.org/john/code/swaks/faq.html
Can be installed by user in user space ... example provided below. Does not require root.
Example quickie showing localhost MTA ... with identification info edited:
[ktask@www ~]$ ls
mail swaks
[ktask@www ~]$ ./swaks
To: ktask@[somenet].net
=== Trying aspmx.l.google.com:25...
=== Connected to aspmx.l.google.com.
<- 220 mx.google.com ESMTP e30si3516457ote.49 - gsmtp
-> EHLO site.sending.network
<- 250-mx.google.com at your service, [xxx.xxx.xxx.xxx]
<- 250-SIZE 157286400
<- 250-8BITMIME
<- 250-STARTTLS
<- 250-ENHANCEDSTATUSCODES
<- 250-PIPELINING
<- 250-CHUNKING
<- 250 SMTPUTF8
-> MAIL FROM:<ktask@[senddingsite.somenet].net>
<- 250 2.1.0 OK e30si3516457ote.49 - gsmtp
-> RCPT TO:<ktask@[somenet].net>
<- 250 2.1.5 OK e30si3516457ote.49 - gsmtp
-> DATA
<- 354 Go ahead e30si3516457ote.49 - gsmtp
-> Date: Fri, 26 Aug 2016 15:34:00 -0400
-> To: ktask@[somenet].net
-> From: ktask@[senddingsite.somenet].net
-> Subject: test Fri, 26 Aug 2016 15:34:00 -0400
-> X-Mailer: swaks v20130209.0 jetmore.org/john/code/swaks/
->
-> This is a test mailing
->
-> .
<- 250 2.0.0 OK 1472240040 e30si3516457ote.49 - gsmtp
-> QUIT
<- 221 2.0.0 closing connection e30si3516457ote.49 - gsmtp
=== Connection closed with remote host.
If one adds options to the command can test sending to your SMTP relay server.
Server admins need all the helpful tools they can get, IMHO! SWAKS is one ... again IMHO.
'spirit of sharing', Ken